I'm giving the image here freely without any restrictions, yada, yada, use it whatever way you like, just don't sue me if someone will tell you you're a mean person :P. You can send the image to your local T-shirt makers, or you can order it from my SpreadShirt store.
The T-shirt looks like this on me:
And a transparent PNG version ideal for a black T-shirt can be downloaded here (Right click, Save Image As):
I got a t-shirt made at a reasonable price here in Croatia at t-shirtmania.hr.
The video of the talk in full on youtube below, and the two posts in a series of getting started on a MEAN stack are here: